CTTextTab.h学习

从 Text Tab Types Text Tab Constants Text Tab Creation Text Tab Access学习

1.Text Tab Types

CFTypeID CTTextTabGetTypeID( void ) CT_AVAILABLE(10_5, 3_2);

2.Text Tab Constants

CT_EXPORT const CFStringRef kCTTabColumnTerminatorsAttributeName CT_AVAILABLE(10_5, 3_2);

3.Text Tab Creation

-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context , CGAffineTransformIdentity);
    CGContextTranslateCTM(context , 0 ,self.bounds.size.height);
    CGContextScaleCTM(context, 1.0 ,-1.0);
    
    ///制表符前后都要有空格，生效。
    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:@"wenjie \t 322.2 \t 2.22 \t 3.33 \n 京晓 \t 5.27 \t 2.4 \t 32.43"];
    NSMutableDictionary * dic=[NSMutableDictionary dictionary];
    CFCharacterSetRef setRef = CFCharacterSetGetPredefined(kCFCharacterSetLowercaseLetter);

    [dic setObject:(__bridge id _Nonnull)(setRef) forKey:(__bridge NSString *)kCTTabColumnTerminatorsAttributeName];
    
    CTTextTabRef textTab = CTTextTabCreate(
                                kCTTextAlignmentLeft,
                                  100,
                                 (__bridge CFDictionaryRef)dic);
    NSDictionary * dicTextTab = (__bridge NSDictionary * )CTTextTabGetOptions(textTab);
    NSLog(@"dic textTab %@",dicTextTab);
    CTTextTabRef textTab1 = CTTextTabCreate(
                                           kCTTextAlignmentCenter,
                                           100,
                                           NULL);
    
   
    
    NSMutableArray * arr= [NSMutableArray array];

   UIView  * view= [[UIView alloc]initWithFrame:CGRectMake(50, 0, 100, 20)];
    view.backgroundColor = [UIColor redColor];
    [self addSubview: view];
    [arr addObject:(__bridge id)textTab];
    [arr addObject:(__bridge id)textTab1];
    
    CGFloat tab = 50;
    CTParagraphStyleSetting setting[2] ;
    setting[0].spec = kCTParagraphStyleSpecifierTabStops;
    setting[0].value =&arr;
    setting[0].valueSize = sizeof(CFArrayRef);
    setting[1].spec = kCTParagraphStyleSpecifierDefaultTabInterval;
    setting[1].value =&tab;
    setting[1].valueSize = sizeof(CGFloat);
    CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(setting, 2);
     dic = [NSMutableDictionary dictionary];
    [dic setObject:(__bridge id)paragraphStyle forKey:(__bridge NSString *)kCTParagraphStyleAttributeName];
    
    
    
    [ mabstring setAttributes:dic range:NSMakeRange(0, mabstring.length)];
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(10 , 40 ,self.bounds.size.width-10 , self.bounds.size.height-60));
    CFRange range = CFRangeMake(0, 0);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,range, Path, NULL);
    CTFrameDraw(frame,context);
    

}

效果：

这个虽然影响制表符 但是没有明显的规律可以查询。

4.Text Tab Access

赏

您的赏赐是我不断更新的动力

微信